A fan-created pack for Fallout 3 swaps many of the textures in Bethesda's
post-apocalyptic RPG sequel with higher-resolution replacements, upgrading the
visuals in the game, though this also places greater demands on your system. The
pack is just under 400 MB, and the download can be found on
AtomicGamer,
eXp Download, and
Gamer's Hell.

Just at a glance they do look really really nice. They also color coded the map too so you can see things at a glance a little better. Everything looks much sharper and clearer, like it's really made for a PC and not showing alot of concessions as a console port.

"Any sufficiently advanced technology is indistinguishable from magic." --Clarke's Third Law